急性(きゅうせい) きゅうせい noun acute (condition) medicalhealth 1. acute; sudden onset (medical condition) Describes diseases or conditions that appear suddenly and often have severe symptoms but typically last a short time. 急性(きゅうせい)胃腸炎(いちょうえん)と診断(しんだん)された。🔊 I was diagnosed with acute gastroenteritis. 急性(きゅうせい)心筋梗塞(しんきんこうそく)で搬送(はんそう)された。🔊 He was transported due to an acute heart attack. 急性(きゅうせい)の症状(しょうじょう)はすぐに治(おさ)まったが、経過観察(けいかかんさつ)が必要(ひつよう)だ。🔊 The acute symptoms subsided quickly, but follow-up observation is needed. Compounds急性(きゅうせい)胃腸炎(いちょうえん): acute gastroenteritis急性(きゅうせい)心筋梗塞(しんきんこうそく): acute myocardial infarction急性(きゅうせい)肝炎(かんえん): acute hepatitis急性(きゅうせい)アルコール中毒(ちゅうどく): acute alcohol poisoningWatch out急性(きゅうせい) is a medical term. For something sudden outside medicine, use 急(きゅう)な or 突然(とつぜん)の: 急(きゅう)な変化(へんか), not 急性(きゅうせい)の変化(へんか).Similar words慢性(まんせい): chronic, the opposite (slow onset, long course). Related Words Antonym: 慢性(まんせい) (chronic) Antonym: 慢性的(まんせいてき) (chronic) general Added 2026.1.30 23:53 · Revised 2026.10.7 3:53 09000/09015_kyuusei